After reading the Eric K post I did some research, and the 1957 World Champion conventional Ploughing contest was held in Peebles, Ohio, a small town in Adams County. There is a memorial in downtown Peebles commemorating the event.
There are no caches in Peebles, Ohio but cache GC13C1A is 2.5 miles from where I think the memorial is located. If you would like I could place the coin in this cache.